Improvement in scaffold-clamps



UNITED STATES PATENT OFFICE.

WILLIAM SMITH, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SCAFFOLD-CLAMPS.

Specification forming part of Letters Patent No- 157,236, dated November 24, 1874; application filed October 3, 1874. 4

To all whom it may concern Be it known that I, WILLIAM SMITH, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and Improved Scaffold-Clamps, of which the following is a specification:

The invention will first be fully described, and then pointed out in the claim.

Figure 1 represents a front elevation of the scaffold. Fig. 2 is a vertical section of Fig. 1, taken on the line 00 x. v

Similar letters of reference indicate corresponding parts.

A A represent scaffoldpoles. B is the metallic clamp, which is fastened to the poles to hold what are known by builders as the ledgerboards 0, which support the outer ends of the put-logs (or short timbers) upon which the scaffoldin g or planks are placed, the inner ends of the put-logs being supported by the wall of the building. The ledger-boardsG are usually nailed to the scaffold-poles, and are split and destroyed when the scaffold is taken away. The clamp is made two feet (more or less) in length, from a bar of flat iron, bent edgewise at right angles, with ends turned and bent flatwise, as represented in dotted lines by D, each foot-piece having a hole, D, to receive a screw, E, which enters the pole, as seen in Fig. 2. The feet D are turned in opposite directions, and the clamp is made to cross the pole diagonally, as seen, so that it may be more securely fastened to hold' the ledger-board, which rests upon its lower arm, as seen at F. The ledger-board is kept snug by means of fillet-pieces G, where they are not of sufficient thickness to fill the space between the pole and the clamp.

With this clamp the scaffold is made perfectly safe, and the ledger-boards are not injured. In fact, no nails are driven through them.

Bolts, instead of screws E, may be used, and the clamp may be made with the foot-piece D turned in one direction, and so that the clamp maybe attached to one side of the pole or vertically; but I prefer the arrangement shown.

I am aware that diagonal clamps having reversed end hooks are already known to the public; but

What I claim is A scaffold-clamp bar, B, having flat and per forated feet D D, adapted to be held to poles A by a pair of screws, as shown and described.

WILLIAM SMITH.

Witnesses:

N. QUIRING, BENJ. RIVERs. 

